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Linear Technology Electronic Components Datasheet

LTC3895EFE Datasheet

Step-Down DC/DC Controller

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LTC3895
150V Low IQ, Synchronous
Step-Down DC/DC Controller
Features
nn Wide VIN Range: 4V to 140V (150V Abs Max)
nn Wide Output Voltage Range: 0.8V to 60V
nn Adjustable Gate Drive Level: 5V to 10V (OPTI-DRIVE)
nn Low Operating IQ: 40μA (Shutdown = 10μA)
nn 100% Duty Cycle Operation
nn No External Bootstrap Diode Required
nn Selectable Gate Drive UVLO Thresholds
nn Onboard LDO or External NMOS LDO for DRVCC
nn EXTVCC LDO Powers Drivers from VOUT
nn Phase-Lockable Frequency (75kHz to 850kHz)
nn Programmable Fixed Frequency (50kHz to 900kHz)
nn Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode® Operation at Light Loads
nn Adjustable Burst Clamp and Current Limit
nn Adjustable or Fixed (5V/3.3V) Output Voltage
nn Power Good Output Voltage Monitor
nn Programmable Input Overvoltage Lockout
nn 38-Lead TSSOP High Voltage Package
Applications
nn Automotive and Industrial Power Systems
nn High Voltage Battery Operated Systems
nn Telecommunications Power Systems
Description
The LTC®3895 is a high performance step-down switching
regulator DC/DC controller that drives an all N-channel
synchronous power MOSFET stage that can operate from
input voltages up to 140V. A constant frequency current
mode architecture allows a phase-lockable frequency of
up to 850kHz.
The gate drive voltage can be programmed from 5V to 10V
to allow the use of logic or standard-level FETs to maxi-
mize efficiency. An integrated switch in the top gate driver
eliminates the need for an external bootstrap diode. An
internal charge pump allows for 100% duty cycle operation.
The low 40μA no-load quiescent current extends operating
run time in battery-powered systems. OPTI-LOOP® com-
pensation allows the transient response to be optimized
over a wide range of output capacitance and ESR values.
The LTC3895 features a precision 0.8V reference and
power good output indicator. The output voltage can be
programmed between 0.8V to 60V using external resistors
or pin-programmed for a fixed 5V or 3.3V.
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo
are registered trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 5481178, 5705919,
5929620, 6144194, 6177787, 6580258.
Typical Application
VIN
7V to 140V
100pF
High Efficiency High Voltage 12V Output Step-Down Regulator
100µF
VIN
NDRV
RUN
TG
0.1µF
DRVCC
4.7µF
BOOST
LTC3895
SW
INTVCC
BG
0.1µF CPUMP_EN
*VOUT FOLLOWS VIN WHEN VIN < 12V
33µH 6mΩ
VOUT
12V*
5A
150µF
x3
10k
4.7nF
ITH
0.1µF
SS
FREQ
30.1k
GND
SENSE+
SENSE–
EXTVCC
VFB
1nF
511k
36.5k
For more information www.linear.com/LTC3895
Efficiency and Power Loss
vs Load Current
100
10k
90
EFFICIENCY
80
1k
70
60
50
VIN = 24V
40
VIN = 48V
30
20
100
POWER LOSS
10
10
0
0.0001
0.001 0.01 0.1
LOAD CURRENT (A)
1
1
10
3895 TA01b
3895fa
1


Linear Technology Electronic Components Datasheet

LTC3895EFE Datasheet

Step-Down DC/DC Controller

No Preview Available !

LTC3895
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (VIN)........................ –0.3V to 150V
Top Side Driver Voltage BOOST................ –0.3V to 150V
Switch Voltage (SW).................................... –5V to 150V
DRVCC, (BOOST-SW) Voltages.....................–0.3V to 11V
BG, TG................................................................ (Note 8)
RUN Voltage............................................. –0.3V to 150V
SENSE+, SENSEVoltages.......................... –0.3V to 65V
PLLIN, PGOOD Voltages............................... –0.3V to 6V
MODE, DRVUV Voltages............................... –0.3V to 6V
ILIM, VPRG, FREQ, PHASMD Voltages......... –0.3V to 6V
DRVSET, CPUMP_EN Voltages...................... –0.3V to 6V
NDRV.................................................................. (Note 9)
EXTVCC Voltage.......................................... –0.3V to 14V
ITH, VFB Voltages.......................................... –0.3V to 6V
SS, OVLO Voltages....................................... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3895E, LTC3895I.......................... –40°C to 125°C
LTC3895H........................................... –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Pin Configuration
OVLO 1
VPRG 2
SENSE+ 3
SENSE4
SS 5
VFB 6
ITH 7
MODE 8
GND 9
CPUMP_EN 10
CLKOUT 11
GND 12
PLLIN 13
PGOOD 14
GND 15
NC 16
FREQ 17
DRVSET 18
DRVUV 19
TOP VIEW
39
GND
38 INTVCC
37 ILIM
36 PHASMD
34 RUN
32 EXTVCC
30 VIN
28 NDRV
26 DRVCC
24 BG
22 BOOST
21 SW
20 TG
FE PACKAGE
VARIATION: FE38(31)
38-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 28°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE
SOLDERED TO PCB FOR RATED ELECTRICAL AND
THERMAL CHARACTERISTICS
Order Information http://www.linear.com/product/LTC3895#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3895EFE#PBF
LTC3895EFE#TRPBF
LTC3895FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3895IFE#PBF
LTC3895IFE#TRPBF
LTC3895FE
38-Lead Plastic TSSOP
–40°C to 125°C
LTC3895HFE#PBF
LTC3895HFE#TRPBF
LTC3895FE
38-Lead Plastic TSSOP
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3895fa
2
For more information www.linear.com/LTC3895


Part Number LTC3895EFE
Description Step-Down DC/DC Controller
Maker Linear
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